Abstract
The purpose of this study is to clarity most suitable ventilation method in tunnelling around the face. The models of a tunnel used were a 1/20 scale model for air experiment and a 1/100 scale model for water experiment. Flow patterns for both models were studied by flow visualization techniques. Velocity distribution of 1/20 scale model was measured.
First of all, the wind direction and velocity in an actual tunnel and a 1/20 scale tunnel model were measured. Then, the similarity flow was confirmed between the tunnel and the scale model. The tracer method was applied for the two-dimensional flow visualization by using Laser light sheet(LLS), and the tuft grit method was applied for three-dimensional flow visualization.
According to these results, it became clear that the most suitable ventilation method in tunnelling around the face was the air pumping type setting the duct at side position.
